[RTTY] RM-11708 Vision of the future

[Kai]

Jay, to answer your queries  ...
Why is this necessary?
Today's rules do not regulate bandwidth, you can use much more than 100 kHz 
legally (the whole CW/data segment) as long as the symbol rate is less than 300 
baud. Foolish but not illegal. [doom and gloom!]. Exception: FSK RTTY (only) is 
restricted to 1500 Hz BW.

The rules are outdated because the attempt to limit signaling BW by limiting 
tone shift (1 kHz) and baud rate (300 Hz). That limits ONLY FSK RTTY to 1500 Hz. 
Modern digital signals are not always "tone-shift" systems, thus their 
bandwdiths are not limited at all, but their symbol rates are! Thus the rules 
are out of date. Written many decades ago, they did not anticipate modern 
digital signaling.

RM-11708 does not "deregulate" but rather REGULATES a maximum limit of 2.8 kHz 
BW WHERE THERE IS NO LIMIT TODAY. [bright spot!]

Experimentation?
That 300 baud limit DOES hamper experimentation. Search the RM-11708 replies for 
N4II's comments. An important MF/HF propagation experiment is stopped dead in 
its track because of that archaic outdated 300 baud limit. [Gloom!]. That 
experiment seeks to measure propagation time-of-flight to within a millisecond 
to discover MY/HF propagation modes - that requires a symbol rate of at least 1 
kHz (and about 2 kHz BW).

Why 2.8 kHz?
The ARRL answer is that 2.8 kHz is already permitted in the channelized bands 
(weak argument, I think), but in any case the FCC will not make it any smaller 
than about 2.4 kHz because of their policy to NOT exclude current users of the 
spectrum. Current users use 2.2 kHz to 2.4 kHz.

RM-11708 effect of amateur-RTTY: NONE (or positive, it will keep the wide data 
modes away, see next item).

It's 2014 and you don't have to wait for that $100 Chinese HF transceiver (which 
might  be limited to 2.8 kHz max by RM-11708). PACTOR-4 is not the problem. 
Today you can legally use Icom's D-STAR at HF in data mode (data only, not voice 
mode) in the CW/data spectrum. D-STAR BW is 6 kHz.
Let me repeat that SIX KILOHERTZ. (D-STAR is meant for digital voice but carries 
a data channel as well, and it has already appeared in the HF voice bands).  
[Doom and Gloom].

RM-11708 will prevent use of D-STAR's 6 kHz wide data mode (and similar systems) 
in the CW/data sub-bands. [Bright spot].

Read the actual proposal (the proposed changes to the rules on the last two 
pages fro example), not the hype.

73 [and may there be only bright spots in your future]
Kai, KE4PT



On 3/14/2014 1:10 PM, Jay WS7I wrote:
> Okay, I would suggest hitting the delete key, however, why are these updates 
> necessary?  Why are these regulations outdated?  Gross generalization that is 
> not proven in any facts.  There is nothing holding back experimentation.  In 
> fact these changes are unduely and on purpose restrictive.  Why a 2.8 kHz 
> limit?  Oh, the ARRL doesn't want spread spectrum but does want antique 
> military modes (anything that fits in 2.8 kHz is an antique mode like 110A/B 
> which  done on a soundcard barely works as good as amateur modes.
>
> Hardware.  Most manufactures like SCS, Hal Communications and others sell most 
> of their equipment in either 3rd party countries for HF use or to a very small 
> minority of users in the U.S.  How many RMS stations are there that will run 
> Pactor IV ?  100??
>
> Jay
>
>
> On 3/14/2014 9:53 AM, Paul Stoetzer wrote:
>> I'm pretty sick of this doom and gloom crap about necessary updates to
>> our massively outdated regulations.
>>
>> 73,
>>
>> Paul, N8HM
>>
>>
>
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